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      <a href="/2018/03/31/vue2-transition-5-list-and-flip/" title="Vue2动画5--FLIP与列表过渡" itemprop="url">Vue2动画5--FLIP与列表过渡</a>
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      <a href="https://godbasin.github.io" title="被删">被删</a>
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    <time datetime="2018-03-31T12:27:57.000Z" itemprop="datePublished">2018-03-31</time>
    更新日期:<time datetime="2018-03-31T12:32:27.092Z" itemprop="dateModified">2018-03-31</time>
    
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			<strong class="toc-title">文章目录</strong>
		<ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link" href="#FLIP"><span class="toc-number">1.</span> <span class="toc-text">FLIP</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#什么是FLIP"><span class="toc-number">1.1.</span> <span class="toc-text">什么是FLIP</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#如何理解FLIP"><span class="toc-number">1.2.</span> <span class="toc-text">如何理解FLIP</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#动画的性能"><span class="toc-number">1.2.1.</span> <span class="toc-text">动画的性能</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#元素的样式规整"><span class="toc-number">1.2.2.</span> <span class="toc-text">元素的样式规整</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#FLIP-过渡"><span class="toc-number">1.2.3.</span> <span class="toc-text">FLIP 过渡</span></a></li></ol></li></ol></li><li class="toc-item toc-level-1"><a class="toc-link" href="#列表过渡"><span class="toc-number">2.</span> <span class="toc-text">列表过渡</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#transition-group-组件"><span class="toc-number">2.1.</span> <span class="toc-text">transition-group 组件</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#demo"><span class="toc-number">2.1.1.</span> <span class="toc-text">demo</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#排序过渡"><span class="toc-number">2.2.</span> <span class="toc-text">排序过渡</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#列表交错过渡"><span class="toc-number">2.3.</span> <span class="toc-text">列表交错过渡</span></a></li></ol></li><li class="toc-item toc-level-1"><a class="toc-link" href="#结束语"><span class="toc-number">3.</span> <span class="toc-text">结束语</span></a></li></ol>
		</div>
		
		<p>最近在捣鼓 Vue 动画的内容，《Vue2 动画》系列用于记录一些使用方法、demo 以及原理分析。本文讲述 Vue 中列表的过渡，以及介绍下 FLIP。</p>
<a id="more"></a>
<h1 id="FLIP"><a href="#FLIP" class="headerlink" title="FLIP"></a>FLIP</h1><hr>
<p>关于 FLIP，在了解之后会有“卧槽还有这种骚操作”的感觉。</p>
<h2 id="什么是FLIP"><a href="#什么是FLIP" class="headerlink" title="什么是FLIP"></a>什么是FLIP</h2><p>这里有个简单的文章来说明 FLIP，包括<a href="https://aerotwist.com/blog/flip-your-animations/" target="_blank" rel="external">原文</a>和<a href="http://web.jobbole.com/83598/" target="_blank" rel="external">译文</a>。</p>
<p>这里借助翻译人员的力量，贴出FLIP四个字母的解释啦。</p>
<p>FLIP 代表 First、Last、Invert、Play：</p>
<ul>
<li><strong>First</strong>：元素参与 transtion 的初始状态。</li>
<li><strong>Last</strong>：元素的最终状态。</li>
<li><strong>Invert</strong>：这里有点意思。你弄清楚了元素从开始到结束是如何改变的，如它的 width、height、opacity。下一步，你应用 transform 和 opacity 的变化来扭转或反转它们。如果元素已经向下移动到初始和结束状态之间的 90px，然后在 Y 轴上应用 transform -90px。这让元素看起来仍然在初始的位置，所以元素并没有达到最终的位置。</li>
<li><strong>Play</strong>：为你之前改变的属性开启过渡，然后移除反转的改变。因为当移除 transform 和 opacity 时，元素都在它们的最终位置。这会缓解从伪造的初始位置到最终位置的计算量。</li>
</ul>
<h2 id="如何理解FLIP"><a href="#如何理解FLIP" class="headerlink" title="如何理解FLIP"></a>如何理解FLIP</h2><p>最初看到这些解释的时候，也是不是很明白在说啥。后面仔细看了下，好骚的操作~</p>
<p>那本骚年就以自身的理解来讲一下这个操作是怎么骚的~</p>
<h3 id="动画的性能"><a href="#动画的性能" class="headerlink" title="动画的性能"></a>动画的性能</h3><p>故事要从很多年前说起，当年 CSS3 还没普遍兼容，我们使用着最原始的jQuery来做动画。那时候怎么做的呢？通常是通过定时器和直接改变元素的 style 来实现动画的，jQuery 的话，一般就是用<code>.animate()</code>来做的。</p>
<p>但是这样做会有什么问题呢？这要从浏览器渲染说起啦。大家可以看看<a href="https://coolshell.cn/articles/9666.html" target="_blank" rel="external">《浏览器的渲染原理简介》</a>这篇文章，里面讲得比较详细。</p>
<p>这里描述下两个概念：</p>
<ul>
<li><strong>Repaint</strong>：屏幕的一部分要重画，比如某个 CSS 的背景色变了。但是元素的几何尺寸没有变。</li>
<li><strong>Reflow</strong>：意味着元件的几何尺寸变了，我们需要重新验证并计算 Render Tree。是 Render Tree 的一部分或全部发生了变化。</li>
</ul>
<p>简单说就是，Reflow 的成本比 Repaint 的成本高得多的多。而我们手动设置这些动画的时候，则可能会中了死穴。</p>
<p>但是不是所有属性动画消耗的性能都一样，其中消耗最低的是 transform 和 opacity 两个属性（当然还有会触发 Composite 的其他 CSS 属性），其次是 Paint 相关属性。相关的分析大家可以参考下<a href="https://www.w3cplus.com/animation/animation-performance.html" target="_blank" rel="external">《CSS Animation性能优化》</a>。</p>
<p>所以从某种角度来说，我们使用 CSS3 的 transform 这些，是可以优化动画性能的。</p>
<h3 id="元素的样式规整"><a href="#元素的样式规整" class="headerlink" title="元素的样式规整"></a>元素的样式规整</h3><p>更多的情况是，我们在计算动画时，通常很难计算最终状态，例如一些元素的重新排列，而我们又希望能有个过渡动画的时候。</p>
<p>通常来说，我们如果真的需要完整地计算整个样式过渡的动画，很多时候只能将元素设置<code>position: absolute/fixed</code>这样实现，但是这样存在很多性能、兼容和响应式问题，不好维护同时也不够灵活。</p>
<p>看看本骚年曾经写过的一个<a href="https://godbasin.github.io/2016/06/20/responsive-waterfall/">《jQuery响应式瀑布流》</a>就知道有多蛋疼了。</p>
<h3 id="FLIP-过渡"><a href="#FLIP-过渡" class="headerlink" title="FLIP 过渡"></a>FLIP 过渡</h3><p>FLIP，本质上它是一个准则，而不是一个框架或库。这是对动画的一种思考，试图在浏览器中能更轻易地让动画达到 60 fps（关于后者，这里先不做过多讨论哈）。</p>
<p><strong>FLIP 将动画翻转</strong>，可以这样理解：</p>
<ol>
<li>正常动画过渡，会计算最终B状态，再减去初始A状态，然后根据想要的过渡时间，定时器设置每段时间的变化，应用到元素上。</li>
<li>FLIP 的做法是，A状态到B状态，不用手动计算每一帧的改变，而是计算从B到A的反向动画，然后下一帧直接切换B状态，在把反向动画应用在B上。</li>
</ol>
<p>其实真实元素是直接从 A-&gt;B，但是由于在B状态上加了反向动画，所以用户看起来像是过渡。</p>
<p>还是看不懂？亮出代码：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// 获取初始位置A</span></div><div class="line"><span class="keyword">var</span> first = el.getBoundingClientRect();</div><div class="line"> </div><div class="line"><span class="comment">// 将其移动到最终位置B</span></div><div class="line">el.classList.add(<span class="string">'totes-at-the-end'</span>);</div><div class="line"> </div><div class="line"><span class="comment">// 获取最终位置B</span></div><div class="line"><span class="keyword">var</span> last = el.getBoundingClientRect();</div><div class="line"> </div><div class="line"><span class="comment">// 翻转，计算B-&gt;A需要的移动</span></div><div class="line"><span class="keyword">var</span> invert = first.top - last.top;</div><div class="line"> </div><div class="line"><span class="comment">// 从翻转的位置到最终位置</span></div><div class="line"><span class="keyword">var</span> player = el.animate([</div><div class="line">  &#123; <span class="attr">transform</span>: <span class="string">'translateY('</span> + invert + <span class="string">'px)'</span> &#125;,</div><div class="line">  &#123; <span class="attr">transform</span>: <span class="string">'translateY(0)'</span> &#125;</div><div class="line">], &#123;</div><div class="line">  <span class="attr">duration</span>: <span class="number">300</span>,</div><div class="line">  <span class="attr">easing</span>: <span class="string">'cubic-bezier(0,0,0.32,1)'</span>,</div><div class="line">&#125;);</div><div class="line"> </div><div class="line"><span class="comment">// 动画结束后做一些处理，如移除样式什么的。</span></div></pre></td></tr></table></figure>
<p>嗯，大概差不多就酱啦。</p>
<h1 id="列表过渡"><a href="#列表过渡" class="headerlink" title="列表过渡"></a>列表过渡</h1><hr>
<h2 id="transition-group-组件"><a href="#transition-group-组件" class="headerlink" title="transition-group 组件"></a>transition-group 组件</h2><p>前面我们讲到 transition 组件，多半用于单个节点，或者是同一时间中只渲染单个节点的情况。</p>
<p>这里我们要渲染多个节点的过渡效果，需要用到 transition-group 组件：</p>
<ul>
<li>不同于 transition（transition 不会转换为真实元素），它会以一个真实元素呈现：默认为一个 <code>&lt;span&gt;</code>。你也可以通过 tag 特性更换为其他元素</li>
<li>内部元素 总是需要 提供唯一的 key 属性值（transition是当有相同标签名的元素切换时，需要通过 key 特性设置唯一的值来标记）</li>
</ul>
<h3 id="demo"><a href="#demo" class="headerlink" title="demo"></a>demo</h3><p>这里看看<a href="https://cn.vuejs.org/v2/guide/transitions.html#%E5%88%97%E8%A1%A8%E7%9A%84%E4%BA%A4%E9%94%99%E8%BF%87%E6%B8%A1" target="_blank" rel="external">官网</a>的例子：</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div></pre></td><td class="code"><pre><div class="line"><span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">"list-demo"</span> <span class="attr">class</span>=<span class="string">"demo"</span>&gt;</span></div><div class="line">  <span class="tag">&lt;<span class="name">button</span> <span class="attr">v-on:click</span>=<span class="string">"add"</span>&gt;</span>Add<span class="tag">&lt;/<span class="name">button</span>&gt;</span></div><div class="line">  <span class="tag">&lt;<span class="name">button</span> <span class="attr">v-on:click</span>=<span class="string">"remove"</span>&gt;</span>Remove<span class="tag">&lt;/<span class="name">button</span>&gt;</span></div><div class="line">  <span class="tag">&lt;<span class="name">transition-group</span> <span class="attr">name</span>=<span class="string">"list"</span> <span class="attr">tag</span>=<span class="string">"p"</span>&gt;</span></div><div class="line">    <span class="tag">&lt;<span class="name">span</span> <span class="attr">v-for</span>=<span class="string">"item in items"</span> <span class="attr">v-bind:key</span>=<span class="string">"item"</span> <span class="attr">class</span>=<span class="string">"list-item"</span>&gt;</span></div><div class="line">      &#123;&#123; item &#125;&#125;</div><div class="line">    <span class="tag">&lt;/<span class="name">span</span>&gt;</span></div><div class="line">  <span class="tag">&lt;/<span class="name">transition-group</span>&gt;</span></div><div class="line"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></div></pre></td></tr></table></figure>
<p>我们稍微改一下，每次随机添加两个、删除两个：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">new</span> Vue(&#123;</div><div class="line">  <span class="attr">el</span>: <span class="string">'#list-demo'</span>,</div><div class="line">  <span class="attr">data</span>: &#123;</div><div class="line">    <span class="attr">items</span>: [<span class="number">1</span>,<span class="number">2</span>,<span class="number">3</span>,<span class="number">4</span>,<span class="number">5</span>,<span class="number">6</span>,<span class="number">7</span>,<span class="number">8</span>,<span class="number">9</span>],</div><div class="line">    <span class="attr">nextNum</span>: <span class="number">10</span></div><div class="line">  &#125;,</div><div class="line">  <span class="attr">methods</span>: &#123;</div><div class="line">    <span class="attr">randomIndex</span>: <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</div><div class="line">      <span class="keyword">return</span> <span class="built_in">Math</span>.floor(<span class="built_in">Math</span>.random() * <span class="keyword">this</span>.items.length)</div><div class="line">    &#125;,</div><div class="line">    <span class="attr">add</span>: <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</div><div class="line">      <span class="keyword">this</span>.items.splice(<span class="keyword">this</span>.randomIndex(), <span class="number">0</span>, <span class="keyword">this</span>.nextNum++)    </div><div class="line">      <span class="keyword">this</span>.items.splice(<span class="keyword">this</span>.randomIndex(), <span class="number">0</span>, <span class="keyword">this</span>.nextNum++)</div><div class="line">    &#125;,</div><div class="line">    <span class="attr">remove</span>: <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</div><div class="line">      <span class="keyword">this</span>.items.splice(<span class="keyword">this</span>.randomIndex(), <span class="number">1</span>)</div><div class="line">      <span class="keyword">this</span>.items.splice(<span class="keyword">this</span>.randomIndex(), <span class="number">1</span>)</div><div class="line">    &#125;,</div><div class="line">  &#125;</div><div class="line">&#125;)</div></pre></td></tr></table></figure>
<figure class="highlight css"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div></pre></td><td class="code"><pre><div class="line"><span class="selector-class">.list-item</span> &#123;</div><div class="line">  <span class="attribute">display</span>: inline-block;</div><div class="line">  <span class="attribute">margin-right</span>: <span class="number">10px</span>;</div><div class="line">&#125;</div><div class="line"><span class="selector-class">.list-enter-active</span>, <span class="selector-class">.list-leave-active</span> &#123;</div><div class="line">  <span class="attribute">transition</span>: all <span class="number">1s</span>;</div><div class="line">&#125;</div><div class="line"><span class="selector-class">.list-enter</span>, <span class="selector-class">.list-leave-to</span></div><div class="line"><span class="comment">/* .list-leave-active for below version 2.1.8 */</span> &#123;</div><div class="line">  <span class="attribute">opacity</span>: <span class="number">0</span>;</div><div class="line">  <span class="attribute">transform</span>: <span class="built_in">translateY</span>(30px);</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<p>或者看<a href="https://jsfiddle.net/godbasin/xubvz597/3/" target="_blank" rel="external">JSFiddle这里</a>。</p>
<p>这里我们能看到，只有新加和删除的元素才会有过渡效果，其他的元素会瞬间移动，没有过渡效果。<br>然后为了解决这个问题，我们需要用到 FLIP。</p>
<h2 id="排序过渡"><a href="#排序过渡" class="headerlink" title="排序过渡"></a>排序过渡</h2><p>什么是排序过渡？大概是：</p>
<ol>
<li>新增的元素有进入动画。</li>
<li>移除的元素有离开动画。</li>
<li>位置移动的元素有移动动画。</li>
</ol>
<p>前面两点我们已经可以通过之前的方式实现了，关于第三点，我们使用 FLIP。</p>
<p>比较关键的，我们看看 Vue 中的实现代码：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// we divide the work into three loops to avoid mixing DOM reads and writes</span></div><div class="line"><span class="comment">// in each iteration - which helps prevent layout thrashing.</span></div><div class="line">children.forEach(callPendingCbs);     <span class="comment">// 1. 之前如果有没结束的过渡，先结束掉</span></div><div class="line">children.forEach(recordPosition);     <span class="comment">// 2. 记录新的位置</span></div><div class="line">children.forEach(applyTranslation);   <span class="comment">// 3. 计算反向动画，生成个CSS动画</span></div><div class="line"></div><div class="line"><span class="comment">// force reflow to put everything in position</span></div><div class="line"><span class="keyword">const</span> body: any = <span class="built_in">document</span>.body;</div><div class="line"><span class="keyword">const</span> f: number = body.offsetHeight; <span class="comment">// eslint-disable-line</span></div><div class="line"></div><div class="line">children.forEach(<span class="function">(<span class="params">c: VNode</span>) =&gt;</span> &#123;</div><div class="line">  <span class="keyword">if</span> (c.data.moved) &#123;</div><div class="line">    <span class="keyword">var</span> el: any = c.elm;</div><div class="line">    <span class="keyword">var</span> s: any = el.style;</div><div class="line">    <span class="comment">// 添加反向CSS动画</span></div><div class="line">    addTransitionClass(el, moveClass);</div><div class="line">    s.transform = s.WebkitTransform = s.transitionDuration = <span class="string">""</span>;</div><div class="line">    <span class="comment">// 监听动画结束，结束之后要移除CSS动画类名啦</span></div><div class="line">    el.addEventListener(</div><div class="line">      transitionEndEvent,</div><div class="line">      (el._moveCb = <span class="function"><span class="keyword">function</span> <span class="title">cb</span>(<span class="params">e</span>) </span>&#123;</div><div class="line">        <span class="keyword">if</span> (!e || <span class="regexp">/transform$/</span>.test(e.propertyName)) &#123;</div><div class="line">          el.removeEventListener(transitionEndEvent, cb);</div><div class="line">          el._moveCb = <span class="literal">null</span>;</div><div class="line">          removeTransitionClass(el, moveClass);</div><div class="line">        &#125;</div><div class="line">      &#125;)</div><div class="line">    );</div><div class="line">  &#125;</div><div class="line">&#125;);</div></pre></td></tr></table></figure>
<p>这里还有个反向动画的计算可能大家会稍微感兴趣：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">applyTranslation</span> (<span class="params">c: VNode</span>) </span>&#123;</div><div class="line">  <span class="keyword">const</span> oldPos = c.data.pos</div><div class="line">  <span class="keyword">const</span> newPos = c.data.newPos</div><div class="line">  <span class="keyword">const</span> dx = oldPos.left - newPos.left</div><div class="line">  <span class="keyword">const</span> dy = oldPos.top - newPos.top</div><div class="line">  <span class="keyword">if</span> (dx || dy) &#123;</div><div class="line">    c.data.moved = <span class="literal">true</span></div><div class="line">    <span class="keyword">const</span> s = c.elm.style</div><div class="line">    s.transform = s.WebkitTransform = <span class="string">`translate(<span class="subst">$&#123;dx&#125;</span>px,<span class="subst">$&#123;dy&#125;</span>px)`</span></div><div class="line">    s.transitionDuration = <span class="string">'0s'</span></div><div class="line">  &#125;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<p>其实也不难，跟上面的 FLIP demo 逻辑相似。</p>
<p>排序过渡中，官方文档提到一个 v-move 特性，它会在元素的改变定位的过程中应用。像前面的类名一样，可以通过 name 属性来自定义前缀，也可以通过 move-class 属性手动设置。</p>
<figure class="highlight css"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div></pre></td><td class="code"><pre><div class="line"><span class="selector-class">.flip-list-move</span> &#123;</div><div class="line">  <span class="attribute">transition</span>: transform <span class="number">1s</span>;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<p>但其实这只是一个设置 transition 的过渡时间和过渡曲线而已，真正的亮点是藏在 FLIP 里面。</p>
<p>具体能实现怎样的效果呢？像<a href="https://jsfiddle.net/chrisvfritz/sLrhk1bc/" target="_blank" rel="external">这个小伙的实现</a>就比较有趣啦~</p>
<h2 id="列表交错过渡"><a href="#列表交错过渡" class="headerlink" title="列表交错过渡"></a>列表交错过渡</h2><p>交错过渡听起来好厉害的样子，其实说白了就是：设置延时，给元素设置顺序延时的动画效果，通过 data 属性与 JavaScript 通信就可以实现啦。</p>
<p>大概就是获取元素的序号，计算延时，然后设置定时器动画啦。看看<a href="https://cn.vuejs.org/v2/guide/transitions.html#%E5%88%97%E8%A1%A8%E7%9A%84%E4%BA%A4%E9%94%99%E8%BF%87%E6%B8%A1" target="_blank" rel="external">官方</a>的demo：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div><div class="line">47</div><div class="line">48</div><div class="line">49</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">new</span> Vue(&#123;</div><div class="line">  <span class="attr">el</span>: <span class="string">'#staggered-list-demo'</span>,</div><div class="line">  <span class="attr">data</span>: &#123;</div><div class="line">    <span class="attr">query</span>: <span class="string">''</span>,</div><div class="line">    <span class="attr">list</span>: [</div><div class="line">      &#123; <span class="attr">msg</span>: <span class="string">'Bruce Lee'</span> &#125;,</div><div class="line">      &#123; <span class="attr">msg</span>: <span class="string">'Jackie Chan'</span> &#125;,</div><div class="line">      &#123; <span class="attr">msg</span>: <span class="string">'Chuck Norris'</span> &#125;,</div><div class="line">      &#123; <span class="attr">msg</span>: <span class="string">'Jet Li'</span> &#125;,</div><div class="line">      &#123; <span class="attr">msg</span>: <span class="string">'Kung Fury'</span> &#125;</div><div class="line">    ]</div><div class="line">  &#125;,</div><div class="line">  <span class="attr">computed</span>: &#123;</div><div class="line">    <span class="attr">computedList</span>: <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</div><div class="line">      <span class="keyword">var</span> vm = <span class="keyword">this</span></div><div class="line">      <span class="keyword">return</span> <span class="keyword">this</span>.list.filter(<span class="function"><span class="keyword">function</span> (<span class="params">item</span>) </span>&#123;</div><div class="line">        <span class="keyword">return</span> item.msg.toLowerCase().indexOf(vm.query.toLowerCase()) !== <span class="number">-1</span></div><div class="line">      &#125;)</div><div class="line">    &#125;</div><div class="line">  &#125;,</div><div class="line">  <span class="attr">methods</span>: &#123;</div><div class="line">    <span class="attr">beforeEnter</span>: <span class="function"><span class="keyword">function</span> (<span class="params">el</span>) </span>&#123;</div><div class="line">      el.style.opacity = <span class="number">0</span></div><div class="line">      el.style.height = <span class="number">0</span></div><div class="line">    &#125;,</div><div class="line">    <span class="attr">enter</span>: <span class="function"><span class="keyword">function</span> (<span class="params">el, done</span>) </span>&#123;</div><div class="line">      <span class="comment">// 看看这里的定时器延时</span></div><div class="line">      <span class="keyword">var</span> delay = el.dataset.index * <span class="number">150</span></div><div class="line">      setTimeout(<span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</div><div class="line">        Velocity(</div><div class="line">          el,</div><div class="line">          &#123; <span class="attr">opacity</span>: <span class="number">1</span>, <span class="attr">height</span>: <span class="string">'1.6em'</span> &#125;,</div><div class="line">          &#123; <span class="attr">complete</span>: done &#125;</div><div class="line">        )</div><div class="line">      &#125;, delay)</div><div class="line">    &#125;,</div><div class="line">    <span class="attr">leave</span>: <span class="function"><span class="keyword">function</span> (<span class="params">el, done</span>) </span>&#123;</div><div class="line">      <span class="comment">// 还有这里的定时器延时</span></div><div class="line">      <span class="keyword">var</span> delay = el.dataset.index * <span class="number">150</span></div><div class="line">      setTimeout(<span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</div><div class="line">        Velocity(</div><div class="line">          el,</div><div class="line">          &#123; <span class="attr">opacity</span>: <span class="number">0</span>, <span class="attr">height</span>: <span class="number">0</span> &#125;,</div><div class="line">          &#123; <span class="attr">complete</span>: done &#125;</div><div class="line">        )</div><div class="line">      &#125;, delay)</div><div class="line">    &#125;</div><div class="line">  &#125;</div><div class="line">&#125;)</div></pre></td></tr></table></figure>
<h1 id="结束语"><a href="#结束语" class="headerlink" title="结束语"></a>结束语</h1><hr>
<p>本节我们介绍了 Vue 中列表过渡，同时介绍了 Vue 实现位移过渡的很重要的方式– FLIP。当然使用FLIP能实现更多酷炫和好玩的效果，取决于你的想象力啦。<br>Vue 后面还讲到动态过渡、可服用过渡和状态过渡，但其实很多都是基于 Javascript 来实现哒。重要的是思想和想法，关于动画，本骚年就不再仔细讲述啦。</p>
  
		
		<p style="margin-top:50px;">查看Github有更多内容噢：<a href="https://github.com/godbasin">https://github.com/godbasin</a></p>
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	<p style="text-align: center;margin-top: 10px;margin-bottom: 20px;">码生艰难，写文不易，给我家猪囤点猫粮了喵~</p>
	<div class="author-right">
  		<p>作者：被删</p>
  		<p>出处：<a href="https://godbasin.github.io">https://godbasin.github.io</a></p>
  		<p>本文版权归作者所有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。</p>
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  <ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link" href="#FLIP"><span class="toc-number">1.</span> <span class="toc-text">FLIP</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#什么是FLIP"><span class="toc-number">1.1.</span> <span class="toc-text">什么是FLIP</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#如何理解FLIP"><span class="toc-number">1.2.</span> <span class="toc-text">如何理解FLIP</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#动画的性能"><span class="toc-number">1.2.1.</span> <span class="toc-text">动画的性能</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#元素的样式规整"><span class="toc-number">1.2.2.</span> <span class="toc-text">元素的样式规整</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#FLIP-过渡"><span class="toc-number">1.2.3.</span> <span class="toc-text">FLIP 过渡</span></a></li></ol></li></ol></li><li class="toc-item toc-level-1"><a class="toc-link" href="#列表过渡"><span class="toc-number">2.</span> <span class="toc-text">列表过渡</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#transition-group-组件"><span class="toc-number">2.1.</span> <span class="toc-text">transition-group 组件</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#demo"><span class="toc-number">2.1.1.</span> <span class="toc-text">demo</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#排序过渡"><span class="toc-number">2.2.</span> <span class="toc-text">排序过渡</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#列表交错过渡"><span class="toc-number">2.3.</span> <span class="toc-text">列表交错过渡</span></a></li></ol></li><li class="toc-item toc-level-1"><a class="toc-link" href="#结束语"><span class="toc-number">3.</span> <span class="toc-text">结束语</span></a></li></ol>
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